diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3758bc6b14..60dc80413c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,25 @@
+## v0.66.1 (2020-11-20)
+
+#### :bug: Bug Fix
+* `@glimmer/integration-tests`, `@glimmer/runtime`
+  * [#1209](https://github.com/glimmerjs/glimmer-vm/pull/1209) Ensure `<output form="some-value">`
+ works properly ([@KrishnaRPatel](https://github.com/KrishnaRPatel))
+
+* `@glimmer/validator`
+  * [#1205](https://github.com/glimmerjs/glimmer-vm/pull/1205) Ensure `@tracked` assertion can be
+made a deprecation. ([@rwjblue](https://github.com/rwjblue))
+
+* `@glimmer/syntax`
+  * [#1204](https://github.com/glimmerjs/glimmer-vm/pull/1204) Ensure `loc` is populated by `build
+ers.element(...)` ([@rwjblue](https://github.com/rwjblue))
+
+#### Committers: 3
+- Chris Garrett ([@pzuraq](https://github.com/pzuraq))
+- Krishna Patel ([@KrishnaRPatel](https://github.com/KrishnaRPatel))
+- Robert Jackson ([@rwjblue](https://github.com/rwjblue))
+
+
+
 ## v0.66.0 (2020-11-17)
 
 #### :boom: Breaking Change
diff --git a/benchmark/package.json b/benchmark/package.json
index 43d0d2c123..c8f4eeec34 100644
--- a/benchmark/package.json
+++ b/benchmark/package.json
@@ -1,9 +1,9 @@
 {
   "name": "glimmer-benchmark",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "private": true,
   "dependencies": {
-    "@glimmer/benchmark-env": "0.66.0",
+    "@glimmer/benchmark-env": "0.66.1",
     "@simple-dom/document": "^1.4.0",
     "@simple-dom/void-map": "^1.4.0",
     "@simple-dom/serializer": "^1.4.0"
diff --git a/lib/local-linker/package.json b/lib/local-linker/package.json
index 49be697ce5..8cdcb7b2da 100644
--- a/lib/local-linker/package.json
+++ b/lib/local-linker/package.json
@@ -1,6 +1,6 @@
 {
   "name": "local-linker",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "private": true,
   "keywords": [
     "ember-addon"
diff --git a/package.json b/package.json
index ea0699c0f5..e5c5e9a75e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "glimmer-engine",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "private": true,
   "description": "Glimmer compiles Handlebars templates into document fragments rather than string buffers",
   "repository": {
diff --git a/packages/@glimmer/benchmark-env/package.json b/packages/@glimmer/benchmark-env/package.json
index b7fe2e379e..36620d741d 100644
--- a/packages/@glimmer/benchmark-env/package.json
+++ b/packages/@glimmer/benchmark-env/package.json
@@ -1,17 +1,17 @@
 {
   "name": "@glimmer/benchmark-env",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "private": true,
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/benchmark-env",
   "dependencies": {
-    "@glimmer/global-context": "0.66.0",
-    "@glimmer/program": "0.66.0",
-    "@glimmer/reference": "0.66.0",
-    "@glimmer/runtime": "0.66.0",
-    "@glimmer/validator": "0.66.0",
-    "@glimmer/util": "0.66.0",
-    "@glimmer/interfaces": "0.66.0",
-    "@glimmer/opcode-compiler": "0.66.0",
+    "@glimmer/global-context": "0.66.1",
+    "@glimmer/program": "0.66.1",
+    "@glimmer/reference": "0.66.1",
+    "@glimmer/runtime": "0.66.1",
+    "@glimmer/validator": "0.66.1",
+    "@glimmer/util": "0.66.1",
+    "@glimmer/interfaces": "0.66.1",
+    "@glimmer/opcode-compiler": "0.66.1",
     "@simple-dom/interface": "^1.4.0"
   },
   "devDependencies": {
diff --git a/packages/@glimmer/compiler/package.json b/packages/@glimmer/compiler/package.json
index 3ddbfe20c0..f20dca0f95 100644
--- a/packages/@glimmer/compiler/package.json
+++ b/packages/@glimmer/compiler/package.json
@@ -1,15 +1,15 @@
 {
   "name": "@glimmer/compiler",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/compiler",
   "dependencies": {
-    "@glimmer/syntax": "0.66.0",
-    "@glimmer/util": "0.66.0",
-    "@glimmer/wire-format": "0.66.0",
-    "@glimmer/interfaces": "0.66.0",
+    "@glimmer/syntax": "0.66.1",
+    "@glimmer/util": "0.66.1",
+    "@glimmer/wire-format": "0.66.1",
+    "@glimmer/interfaces": "0.66.1",
     "@simple-dom/interface": "^1.4.0"
   },
   "devDependencies": {
-    "@glimmer/local-debug-flags": "0.66.0"
+    "@glimmer/local-debug-flags": "0.66.1"
   }
 }
diff --git a/packages/@glimmer/debug/package.json b/packages/@glimmer/debug/package.json
index 7fcfebb197..4a5909cb5c 100644
--- a/packages/@glimmer/debug/package.json
+++ b/packages/@glimmer/debug/package.json
@@ -1,13 +1,13 @@
 {
   "name": "@glimmer/debug",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/debug",
   "private": true,
   "dependencies": {
-    "@glimmer/interfaces": "0.66.0",
-    "@glimmer/program": "0.66.0",
-    "@glimmer/util": "0.66.0",
-    "@glimmer/vm": "0.66.0",
+    "@glimmer/interfaces": "0.66.1",
+    "@glimmer/program": "0.66.1",
+    "@glimmer/util": "0.66.1",
+    "@glimmer/vm": "0.66.1",
     "@simple-dom/interface": "^1.4.0"
   },
   "devDependencies": {
diff --git a/packages/@glimmer/dom-change-list/package.json b/packages/@glimmer/dom-change-list/package.json
index 077d3595b8..16620b2098 100644
--- a/packages/@glimmer/dom-change-list/package.json
+++ b/packages/@glimmer/dom-change-list/package.json
@@ -1,10 +1,10 @@
 {
   "name": "@glimmer/dom-change-list",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/dom-change-list",
   "dependencies": {
-    "@glimmer/util": "0.66.0",
-    "@glimmer/interfaces": "0.66.0",
+    "@glimmer/util": "0.66.1",
+    "@glimmer/interfaces": "0.66.1",
     "@simple-dom/document": "^1.4.0",
     "@simple-dom/interface": "^1.4.0"
   },
diff --git a/packages/@glimmer/encoder/package.json b/packages/@glimmer/encoder/package.json
index fb5a45d056..b6922f2b87 100644
--- a/packages/@glimmer/encoder/package.json
+++ b/packages/@glimmer/encoder/package.json
@@ -1,9 +1,9 @@
 {
   "name": "@glimmer/encoder",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/encoder",
   "dependencies": {
-    "@glimmer/interfaces": "0.66.0",
-    "@glimmer/vm": "0.66.0"
+    "@glimmer/interfaces": "0.66.1",
+    "@glimmer/vm": "0.66.1"
   }
 }
diff --git a/packages/@glimmer/global-context/package.json b/packages/@glimmer/global-context/package.json
index 521f9b846d..f4c5724122 100644
--- a/packages/@glimmer/global-context/package.json
+++ b/packages/@glimmer/global-context/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@glimmer/global-context",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/global-context",
   "dependencies": {
     "@glimmer/env": "^0.1.7"
diff --git a/packages/@glimmer/integration-tests/package.json b/packages/@glimmer/integration-tests/package.json
index 0f3088df09..6de00d87cf 100644
--- a/packages/@glimmer/integration-tests/package.json
+++ b/packages/@glimmer/integration-tests/package.json
@@ -1,21 +1,21 @@
 {
   "name": "@glimmer/integration-tests",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "private": true,
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/integration-tests",
   "dependencies": {
-    "@glimmer/global-context": "0.66.0",
-    "@glimmer/reference": "0.66.0",
-    "@glimmer/runtime": "0.66.0",
-    "@glimmer/syntax": "0.66.0",
-    "@glimmer/validator": "0.66.0",
-    "@glimmer/compiler": "0.66.0",
-    "@glimmer/util": "0.66.0",
-    "@glimmer/wire-format": "0.66.0",
-    "@glimmer/interfaces": "0.66.0",
-    "@glimmer/node": "0.66.0",
-    "@glimmer/opcode-compiler": "0.66.0",
-    "@glimmer/program": "0.66.0",
+    "@glimmer/global-context": "0.66.1",
+    "@glimmer/reference": "0.66.1",
+    "@glimmer/runtime": "0.66.1",
+    "@glimmer/syntax": "0.66.1",
+    "@glimmer/validator": "0.66.1",
+    "@glimmer/compiler": "0.66.1",
+    "@glimmer/util": "0.66.1",
+    "@glimmer/wire-format": "0.66.1",
+    "@glimmer/interfaces": "0.66.1",
+    "@glimmer/node": "0.66.1",
+    "@glimmer/opcode-compiler": "0.66.1",
+    "@glimmer/program": "0.66.1",
     "@glimmer/bundle-compiler": "^0.60.0",
     "@simple-dom/document": "^1.4.0",
     "@simple-dom/interface": "^1.4.0",
diff --git a/packages/@glimmer/interfaces/package.json b/packages/@glimmer/interfaces/package.json
index 9f06e87f86..5d4b0df7e2 100644
--- a/packages/@glimmer/interfaces/package.json
+++ b/packages/@glimmer/interfaces/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@glimmer/interfaces",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/interfaces",
   "types": "index.d.ts",
   "module": "index.d.ts",
diff --git a/packages/@glimmer/local-debug-flags/package.json b/packages/@glimmer/local-debug-flags/package.json
index bdc3640cdf..56e58c5d00 100644
--- a/packages/@glimmer/local-debug-flags/package.json
+++ b/packages/@glimmer/local-debug-flags/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@glimmer/local-debug-flags",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "description": "Helpers for debugging during local development. These get stripped from published builds. This package should not be published.",
   "private": true
 }
diff --git a/packages/@glimmer/low-level/package.json b/packages/@glimmer/low-level/package.json
index c3263e9d87..0b85f260f8 100644
--- a/packages/@glimmer/low-level/package.json
+++ b/packages/@glimmer/low-level/package.json
@@ -1,5 +1,5 @@
 {
   "name": "@glimmer/low-level",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/low-level"
 }
diff --git a/packages/@glimmer/node/package.json b/packages/@glimmer/node/package.json
index 3900129495..701b081a58 100644
--- a/packages/@glimmer/node/package.json
+++ b/packages/@glimmer/node/package.json
@@ -1,16 +1,16 @@
 {
   "name": "@glimmer/node",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/node",
   "dependencies": {
-    "@glimmer/runtime": "0.66.0",
-    "@glimmer/interfaces": "0.66.0",
-    "@glimmer/util": "0.66.0",
+    "@glimmer/runtime": "0.66.1",
+    "@glimmer/interfaces": "0.66.1",
+    "@glimmer/util": "0.66.1",
     "@simple-dom/document": "^1.4.0",
     "@simple-dom/interface": "^1.4.0"
   },
   "devDependencies": {
     "@types/qunit": "^2.9.0",
-    "@glimmer/compiler": "0.66.0"
+    "@glimmer/compiler": "0.66.1"
   }
 }
diff --git a/packages/@glimmer/opcode-compiler/package.json b/packages/@glimmer/opcode-compiler/package.json
index a4f0f50b64..cc4f124f8c 100644
--- a/packages/@glimmer/opcode-compiler/package.json
+++ b/packages/@glimmer/opcode-compiler/package.json
@@ -1,18 +1,18 @@
 {
   "name": "@glimmer/opcode-compiler",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/opcode-compiler",
   "dependencies": {
-    "@glimmer/util": "0.66.0",
-    "@glimmer/wire-format": "0.66.0",
-    "@glimmer/interfaces": "0.66.0",
-    "@glimmer/program": "0.66.0",
-    "@glimmer/vm": "0.66.0",
-    "@glimmer/encoder": "0.66.0",
-    "@glimmer/reference": "0.66.0"
+    "@glimmer/util": "0.66.1",
+    "@glimmer/wire-format": "0.66.1",
+    "@glimmer/interfaces": "0.66.1",
+    "@glimmer/program": "0.66.1",
+    "@glimmer/vm": "0.66.1",
+    "@glimmer/encoder": "0.66.1",
+    "@glimmer/reference": "0.66.1"
   },
   "devDependencies": {
-    "@glimmer/debug": "0.66.0",
-    "@glimmer/local-debug-flags": "0.66.0"
+    "@glimmer/debug": "0.66.1",
+    "@glimmer/local-debug-flags": "0.66.1"
   }
 }
diff --git a/packages/@glimmer/program/package.json b/packages/@glimmer/program/package.json
index 36bd31eb6f..9783a5b0b6 100644
--- a/packages/@glimmer/program/package.json
+++ b/packages/@glimmer/program/package.json
@@ -1,13 +1,13 @@
 {
   "name": "@glimmer/program",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/program",
   "dependencies": {
-    "@glimmer/util": "0.66.0",
-    "@glimmer/interfaces": "0.66.0",
-    "@glimmer/encoder": "0.66.0"
+    "@glimmer/util": "0.66.1",
+    "@glimmer/interfaces": "0.66.1",
+    "@glimmer/encoder": "0.66.1"
   },
   "devDependencies": {
-    "@glimmer/local-debug-flags": "0.66.0"
+    "@glimmer/local-debug-flags": "0.66.1"
   }
 }
diff --git a/packages/@glimmer/reference/package.json b/packages/@glimmer/reference/package.json
index d3a3fba9eb..1bc303afc5 100644
--- a/packages/@glimmer/reference/package.json
+++ b/packages/@glimmer/reference/package.json
@@ -1,13 +1,13 @@
 {
   "name": "@glimmer/reference",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "description": "Objects used to track values and their dirtiness in Glimmer",
   "license": "MIT",
   "dependencies": {
     "@glimmer/env": "^0.1.7",
-    "@glimmer/global-context": "0.66.0",
-    "@glimmer/interfaces": "0.66.0",
-    "@glimmer/util": "0.66.0",
-    "@glimmer/validator": "0.66.0"
+    "@glimmer/global-context": "0.66.1",
+    "@glimmer/interfaces": "0.66.1",
+    "@glimmer/util": "0.66.1",
+    "@glimmer/validator": "0.66.1"
   }
 }
diff --git a/packages/@glimmer/runtime/package.json b/packages/@glimmer/runtime/package.json
index 4191e77dbf..0e8bf22625 100644
--- a/packages/@glimmer/runtime/package.json
+++ b/packages/@glimmer/runtime/package.json
@@ -1,26 +1,26 @@
 {
   "name": "@glimmer/runtime",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "description": "Minimal runtime needed to render Glimmer templates",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/runtime",
   "license": "MIT",
   "dependencies": {
     "@glimmer/env": "0.1.7",
-    "@glimmer/global-context": "0.66.0",
-    "@glimmer/low-level": "0.66.0",
-    "@glimmer/util": "0.66.0",
-    "@glimmer/reference": "0.66.0",
-    "@glimmer/validator": "0.66.0",
-    "@glimmer/wire-format": "0.66.0",
-    "@glimmer/interfaces": "0.66.0",
-    "@glimmer/program": "0.66.0",
-    "@glimmer/vm": "0.66.0",
+    "@glimmer/global-context": "0.66.1",
+    "@glimmer/low-level": "0.66.1",
+    "@glimmer/util": "0.66.1",
+    "@glimmer/reference": "0.66.1",
+    "@glimmer/validator": "0.66.1",
+    "@glimmer/wire-format": "0.66.1",
+    "@glimmer/interfaces": "0.66.1",
+    "@glimmer/program": "0.66.1",
+    "@glimmer/vm": "0.66.1",
     "@simple-dom/interface": "^1.4.0"
   },
   "devDependencies": {
-    "@glimmer/local-debug-flags": "0.66.0",
-    "@glimmer/opcode-compiler": "0.66.0",
-    "@glimmer/debug": "0.66.0",
+    "@glimmer/local-debug-flags": "0.66.1",
+    "@glimmer/opcode-compiler": "0.66.1",
+    "@glimmer/debug": "0.66.1",
     "@types/qunit": "^2.9.0"
   }
 }
diff --git a/packages/@glimmer/syntax/package.json b/packages/@glimmer/syntax/package.json
index c7396086d0..13a993350a 100644
--- a/packages/@glimmer/syntax/package.json
+++ b/packages/@glimmer/syntax/package.json
@@ -1,15 +1,15 @@
 {
   "name": "@glimmer/syntax",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/syntax",
   "dependencies": {
-    "@glimmer/interfaces": "0.66.0",
-    "@glimmer/util": "0.66.0",
+    "@glimmer/interfaces": "0.66.1",
+    "@glimmer/util": "0.66.1",
     "@handlebars/parser": "^1.1.0",
     "simple-html-tokenizer": "^0.5.10"
   },
   "devDependencies": {
-    "@glimmer/local-debug-flags": "0.66.0",
+    "@glimmer/local-debug-flags": "0.66.1",
     "@types/qunit": "^2.9.0"
   }
 }
diff --git a/packages/@glimmer/util/package.json b/packages/@glimmer/util/package.json
index 9837d0d676..f44a0f5094 100644
--- a/packages/@glimmer/util/package.json
+++ b/packages/@glimmer/util/package.json
@@ -1,16 +1,16 @@
 {
   "name": "@glimmer/util",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "description": "Common utilities used in Glimmer",
   "repository": "https://github.com/tildeio/glimmer/tree/master/packages/@glimmer/util",
   "license": "MIT",
   "dependencies": {
     "@glimmer/env": "0.1.7",
-    "@glimmer/interfaces": "0.66.0",
+    "@glimmer/interfaces": "0.66.1",
     "@simple-dom/interface": "^1.4.0"
   },
   "devDependencies": {
-    "@glimmer/local-debug-flags": "0.66.0",
+    "@glimmer/local-debug-flags": "0.66.1",
     "@types/qunit": "^2.9.0",
     "@simple-dom/interface": "^1.4.0"
   },
diff --git a/packages/@glimmer/validator/package.json b/packages/@glimmer/validator/package.json
index 917334349b..1e98ac3a9f 100644
--- a/packages/@glimmer/validator/package.json
+++ b/packages/@glimmer/validator/package.json
@@ -1,10 +1,10 @@
 {
   "name": "@glimmer/validator",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "description": "Objects used to track values and their dirtiness in Glimmer",
   "license": "MIT",
   "dependencies": {
     "@glimmer/env": "^0.1.7",
-    "@glimmer/global-context": "0.66.0"
+    "@glimmer/global-context": "0.66.1"
   }
 }
diff --git a/packages/@glimmer/vm/package.json b/packages/@glimmer/vm/package.json
index 6da619915e..f1fe9afa43 100644
--- a/packages/@glimmer/vm/package.json
+++ b/packages/@glimmer/vm/package.json
@@ -1,10 +1,10 @@
 {
   "name": "@glimmer/vm",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/vm",
   "dependencies": {
-    "@glimmer/util": "0.66.0",
-    "@glimmer/interfaces": "0.66.0"
+    "@glimmer/util": "0.66.1",
+    "@glimmer/interfaces": "0.66.1"
   },
   "typings": "index.ts"
 }
diff --git a/packages/@glimmer/wire-format/package.json b/packages/@glimmer/wire-format/package.json
index 4ecb299ec1..a852a5826a 100644
--- a/packages/@glimmer/wire-format/package.json
+++ b/packages/@glimmer/wire-format/package.json
@@ -1,11 +1,11 @@
 {
   "name": "@glimmer/wire-format",
-  "version": "0.66.0",
+  "version": "0.66.1",
   "description": "",
   "repository": "https://github.com/glimmerjs/glimmer-vm/tree/master/packages/@glimmer/wire-format",
   "license": "MIT",
   "dependencies": {
-    "@glimmer/util": "0.66.0",
-    "@glimmer/interfaces": "0.66.0"
+    "@glimmer/util": "0.66.1",
+    "@glimmer/interfaces": "0.66.1"
   }
 }